NAT 802 009 Switch Panel Installation and Operation Manual
Below you will find brief information for Switch Panel 802 009. The Switch Panel 802 009 is designed to control a single Model 700-xxx Digital Audio Control Amplifier. It also provides microphone audio switching and keying operations for four radio transmitters in addition to features such as antenna switching unit control, marker (MKR) receiver sensitivity control and public address (PA) amplifier control. The 802-009 Switch Panel continuously reads the status of its own audio control switches and volume control potentiometers and compiles this information into the form of a digital signal.
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Installation and Operation Manual
802-009 Switch Panel
SM802
ISSUE 4.12
Northern Airborne Technology Ltd.
1925 Kirschner Road
Kelowna, BC, Canada.
V1Y 4N7
Telephone (250) 763-2232
Facsimile (250) 762-3374
Issued on the authority of Northern Airborne Technology Ltd.
Copyright 2005
802-009 Switch Panel
SM802 Installation and Operation Manual
Installation and Operation Manual
ENG-FORM: 820-0115.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
Page ii
802-009 Switch Panel
SM802 Installation and Operation Manual
Prepared By: Checked By:
The status of this installation and operation manual is controlled by issue shown on the title page. The status of each section is controlled by revision shown in the footer of each page. All revisions affecting sections of this manual have been incorporated into the latest issue.
ISSUE/REVISION RECORD
Manual Issue
Number
Section
Revision Number
Revision Description Issue Date
4.12
4.11
Update for current drawings.
Update to current templates.
Jun 24, 2010
Sep 12, 2008
Section 2 Rev. 1.00
Section 1 Rev. 1.00
Section 2 Rev. 1.00
Section 3 Rev. 1.00
Installation and Operation Manual
ENG-FORM: 820-0115.DOT
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CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
802-009 Switch Panel
SM802 Installation and Operation Manual
Table of Contents
Section Title
1. Description
1.1 Introduction
1.4 Specifications
2. Installation
2.1 Introduction
2.2 Unpacking and Inspection
2.2.1 Warranty
2.4.1 Warnings
2.4.2 Cautions
2.5.1 Adjustments
2.5.3 Numerical Pin Identification List
3. Operation
3.1 Introduction
3.3.1
3.3.2
3.3.4
3.3.5
Master Volume, Transceiver and Receiver Controls
MIC SELECT Switch
NORM MIC/OXY MIC Switch
HI/LO MKR Sensitivity Switch
Installation and Operation Manual
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802-009 Switch Panel
SM802 Installation and Operation Manual
Section 1 Description
1.1 Introduction
Information in this section consists of product description, design features and specifications for the
802-009 Switch Panel. All derivative product information shall be contained in the applicable manual supplement, which may be obtained from NAT as required.
Review all notes, warnings and cautions.
1.2 Product Description
The 802-009 Switch Panel is designed to control a single Model 700-xxx Digital Audio Control Amplifier. It also provides microphone audio switching and keying operations for four radio transmitters in addition to features such as antenna switching unit control, marker (MKR) receiver sensitivity control and public address (PA) amplifier control. The 802-009 Switch Panel continuously reads the status of its own audio control switches and volume control potentiometers and compiles this information into the form of a digital signal. The digital signal is sent to the Model 700 from the switch panel in RS422 serial format via a twisted, shielded wire pair. The Model 700 receives, demultiplexes and converts this digital signal into audio control information.
1.3 Design Features
The 802-009 Switch Panel is capable of digitally controlling all Model 700 amplifier functions. These include the 12 receiver input switches and individual volume controls, the four sidetone input switches and sidetone volume control, three microphone inputs, the microphone input switch, antenna switching, the interphone switches and volume control, the cockpit speaker switch and volume control, the headphone volume control and the NAV/ADF Voice/Ident filter switching functions.
The 802 Switch Panel is a customizable unit capable of providing control for up to four transceivers, eight receivers and a public address. For information on other configurations, contact the Product Support
Department at NAT Ltd.
Panel nomenclature and knob illumination is provided on the 802-009 Switch Panel. The power supply inputs for the panel overlay and knob internal light plate are independent of each other and may be lit at different levels of brightness. The MIC SELECT knob and the NORM MIC/OXY MIC knob are lit with the panel overlay. Neoprene washers are installed around each of the volume control knobs between the overlay and front panel sheet metal to prevent light leakage from being radiated by the knob illuminating light plate into the cockpit. The PHONE and PASS knobs are always in the OUT and lighted position, since there is no switching associated with them.
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802-009 Switch Panel
SM802 Installation and Operation Manual
Specifications 1.4
1.4.1 Electrical Specifications
Power
Input
Lighting
Knobs
Mic Inputs
NORM MIC
OXY MIC
Outputs
HOT MIC
+28 Vdc at 0.30 A max.
1 A circuit breaker recommended.
0 to 115 Vac, 400 Hz.
Independent from knob lighting.
0 to 5 Vdc.
Independent from faceplate lighting.
Knobs light in OUT or ON position only.
35
35
±5 mA microphone bias current.
±5 mA microphone bias current.
A direct connection from the selected mic input to the HOT MIC output, which is connected to the Model 700 amplifier HOT MIC input.
Transmitter & PA MIC’s A direct connection from the selected mic input to the selected transmitter or PA mic output.
MUX Data
Volume Controls
PASS
BRIEFER
RS422
Impedance 10 k
Power 0.5 W
Impedance 10 k
Power 0.5 W
Ω
Ω
1.4.2 Physical Specifications
Height
Depth
Width
Weight
Mounting
3.93" (99.8 mm) max.
6.03" (153.2 mm) max. behind panel, excluding connector
5.67" (144.0 mm) max.
3.0 lbs (1.4 kg) max.
Panel mount with four 8-32 screws
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Connector
Faceplate
802-009 Switch Panel
SM802 Installation and Operation Manual
55 pin circular
Grey with white text
1.4.3 Environmental Specifications
Temperature -55 to +70
°C
Qualification of the 802-009 Switch Panel was completed in accordance with
DO-160C Env. Cat. [A2F2]-BA[CL]XXXXXXZ[BZ]AZZUZLXX.
Note: Refer to Environmental Qualification Form located in Section 2 of this Manual for complete details of the environmental categories.
1.4.4 Product Approval
FAA: TSO-C50c (RTCA/DO-170, RTCA/DO-160C, RTCA/DO-178A Level 2)
Section 1 ends
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802-009 Switch Panel
SM802 Installation and Operation Manual
Section 2 Installation
2.1 Introduction
Information in this section consists of unpacking and inspection procedures, installation procedures, post-installation checks and installation drawings for the 802-009 Switch Panel.
Review all notes, warnings and cautions.
2.2 Unpacking and Inspection
Unpack the equipment carefully and locate the warranty card. Inspect the unit visually for damage due to shipping and report all such claims immediately to the carrier involved. Check that all items listed below are present before proceeding and report any shortage immediately to your supplier:
- Warranty Card
- Operators Manual
- Certificate of Conformity or Release Certification
2.2.1 Warranty
All Northern Airborne Technology Ltd. products are warranted for 2 years from date of installation by an authorized Northern Airborne Technology Ltd. dealer, to be free of defects in workmanship or performance. This warranty covers all materials and labour, but is exclusive of any transport to deliver the defective unit to and from Northern Airborne Technology Ltd. or its designated warranty repair center, or any labour to remove or re-install the defective unit in the aircraft. Contact Northern Airborne Technology
Ltd. for any questions regarding this warranty, its applicability to your units and/or for return authorization.
Northern Airborne Technology Ltd. is the final arbitrator concerning warranty administration. Units which have been physically damaged, burned, immersed in water or otherwise abused beyond the scope of normal use will not be considered for warranty. WARRANTY IS VOID UNLESS THE PRODUCT IS
INSTALLED BY AN AUTHORIZED NORTHERN AIRBORNE TECHNOLOGY LTD. DEALER. Product for which a warranty card is not returned shall be warranted from date of manufacture.
2.3 Continued Airworthiness
Maintenance of the 802-009 Switch Panel is ‘on condition’ only. Periodic maintenance of this product is not required.
2.4 Installation Procedures
2.4.1 Warnings
WARNING:
High volume settings can cause hearing damage.
Set the headset volume control to the minimum volume setting prior to conducting tests, and slowly increase the headset volume to a comfortable listening level.
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Cautions
802-009 Switch Panel
SM802 Installation and Operation Manual
2.4.2
CAUTION:
Do not bundle any lines from this unit with transmitter coax lines. Do not bundle any audio or DC power lines from this unit with 400 Hz synchro wiring or AC power lines. Do not position this unit or wiring from this unit next to any device with a strong alternating magnetic field such as an inverter, or significant audio interference will result.
CAUTION:
In all installations, use shielded cable exactly as shown and ground as indicated. Significant ground loop and noise problems may result from not following these guidelines. Ensure that the chassis is grounded to provide proper shield terminations.
Ensure the microphone and headphone jacks are isolated from the airframe ground. Use caution when routing microphone wiring, as it carries low-level signals prone to coupling from other sources.
Do not take a ground from the instrument panel or similar location that shares a ground return with a turn and bank, horizon or other motor driven instrument. This may cause the unit to pick up the sound of the motor as ground loop interference.
2.4.3 Cabling and Wiring
All wire shall be selected in accordance with the original aircraft manufacturer's Maintenance Instructions or AC43.13-1B Change 1, Paragraphs 11-76 through 11-78. Unshielded wire types shall qualify to
MIL-W-22759 as specified in AC43.13-1B Change 1, Paragraphs 11-85, 11-86, and listed in Table 11-11.
For shielded wire applications, use Tefzel MIL-C-27500 shielded wire with solder sleeves (for shield terminations) to make the most compact and easily terminated interconnect. Follow the wiring diagrams in
Section 2.6 as required.
Allow 3" from the end of the shielded wiring to the shield termination. Reference the interconnect drawing in Section 2.6 for shield termination details. Aircraft harnessing shall permit the unit to be lowered from the panel for easy access to all side adjustments. Do NOT mount the unit until all adjustments have been performed.
Maintain wire segregation and route wiring in accordance with the original aircraft manufacturers
Maintenance Instructions. Coaxial cables shall be routed separately from existing wire bundles in the aircraft to minimize electromagnetic coupling effects.
Unless otherwise noted, all wiring shall be a minimum of 24 AWG, except power and ground lines, which shall be a minimum of 20 AWG. Reference the Interconnect drawing for additional specifications. Check that the ground connection is clean and well secured, and that it shares no path with any electrically noisy aircraft accessories such as blowers, turn and bank instruments or similar loads. Power to this unit must be supplied from a separate circuit breaker or fuse (fast blow), and not attached to any other circuit breaker without additional protection. Verify that the selected circuit breaker size and wire gauge are adequate for the installation using the techniques specified in AC43.13-1B Change 1, Paragraphs 11-47 through 11-51 and 11-66 through 11-69.
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802-009 Switch Panel
SM802 Installation and Operation Manual
2.4.4 Mechanical Mounting
Installation dimensions are shown on the Outline drawing 802-009 listed in Section 2.6. No shock or vibration isolators are required for mounting.
The 802-009 Switch Panel may be mounted to a metal, plastic or composite surface however, it is absolutely necessary to ground the enclosure to the metal aircraft ground structure. When mounting to a plastic or composite surface, use a grounding strap. An 8-32" x 1/2" grounding stud is provided on the rear of the enclosure for chassis grounding. The switch panel enclosure and mounting surface is finished with an electrically conductive film. It is not necessary to remove the film for electrical bonding to any metal aircraft ground structure.
If replacement of the front panel overlay is necessary, it may be removed by first loosening the set screws on the MIC SELECT and NORM MIC/OXY MIC knobs and removing the knobs. Then the four 4-40 flush socket head screws on the backside of the mounting flanges may be removed and the overlay may be pulled off straight forward. Installing a new overlay requires the same steps in reverse order however, care should be taken to align the overlay before tightening the four 4-40 socket head screws so that the lighting power connector mates properly and the lighted knobs do not rub on their through holes in the overlay.
2.4.5 Installation Notes
Connecting P1-8 of the pilot's 802-009 to P1-7 of the copilot's 802-009 provides relay switching of the
802-009 PASS volume control to the paging amplifier. When the PA volume relay internal to the 802-009 is in the relaxed position, the BRIEFER preset volume potentiometer in the rear of the copilot 802-009 is connected to the paging amplifier. When the TRANSMIT SELECTOR switch is placed in the PASS position and PTT is keyed, the PA VOLUME relay is energized, connecting the PASS volume control on the 802-009 front panel to the paging amplifier. The PA volume interconnect line allows this logic to function for both pilot and copilot positions.
If the INPH LISTEN input on the 802-009 is grounded, then interphone audio may be heard on the headphones at all times however, the INPH switch must still be turned ON in order to talk on the interphone with the normal boom or oxygen mask mics. In addition to the HOT MIC microphone output, there are six other microphone outputs provided, one each for the selected transmitter or PA amplifier.
2.4.5.1 MIC INPUTS
NORM MIC The NORM MIC input, intended for the normal boom or headset microphone, is compatible with carbon and amplified dynamic microphones. This input may be used for both interphone communications and transmitting. A transmitter is keyed for this mic input using the yoke mounted PTT switch.
OXY MIC The OXY MIC input, intended for the oxygen mask microphone, is compatible with carbon and amplified dynamic microphones. This input may be used for both interphone communications and transmitting. A transmitter is keyed for this mic input using the yoke mounted PTT switch.
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HAND MIC
802-009 Switch Panel
SM802 Installation and Operation Manual
The HAND MIC input, intended for the hand held microphone, is compatible with carbon and amplified dynamic microphones. It receives its bias current from the Model 700 amplifier through the 802-009 to Model 700 HOT MIC connection. This input may be used for transmitting only and not for interphone communications. A transmitter is keyed for this mic input using the PTT switch on the hand held microphone.
2.4.5.2 OUTPUTS
HOT MIC A HOT MIC microphone output is provided on the 802-009 to make this connection to the
Model 700 HOT MIC input. This connects any one selected microphone input (NORM,
OXY, or HAND) directly to the Model 700 HOT MIC input, which channels the microphone audio to the Model 700 cockpit voice recorder (CVR) output for hot microphone recording purposes. The HOT MIC input of the Model 700 Amplifier is also used for interphone communication with the NORM and OXY MIC inputs when the INPH switch on the 802-009 is turned ON. The HAND MIC input is used for transmitting or PA only and not for interphone communications.
TX & PA MICs During a transmit PTT, these outputs are simply a direct connection from the microphone input being used to the selected transmitter or PA mic output. The mic audio input is connected to the output selected by the MIC SELECT switch on the switch panel. These outputs are intended for connection to respective transmitter and PA amplifier mic inputs.
MUX DATA This output is a RS422 differential data transmission line driver intended for connection to the Model 700 amplifier MUX DATA input. It transfers all of the digital data necessary to control Model 700 functions via a shielded twisted-pair wire cable up to 4,000 feet long.
2.4.5.3 VOLUME CONTROLS
RECEIVERS These volume controls are linear taper potentiometers connected internally to the digital multiplexing circuitry. Volume control range and curve are defined in Model 700 amplifier software.
Same as RECEIVERS volume. INPH
PHONE Same as RECEIVERS volume.
SPKR
PASS/
Same as RECEIVERS volume.
BRIEFER
The PASS volume knob controls the level of the PA amplifier output only when the MIC
SELECT Switch is in the PASS position. This is a 10 k
Ω, 0.5 W, linear taper potentiometer connected through relay switching logic to pin P1-14 of the Model 802.
Maximum volume position (fully clockwise) provides maximum resistance. Volume control range and curve are determined by PA amplifier circuitry. Refer to Section 2.4.5 for more details.
2.4.5.4 ANTENNA SWITCHING
P1-32 should be connected to 28 VDC or ground to suit the requirements of the Antenna Switching Unit.
When the MIC SELECT switch is in the HF1 position, P1-32 and P1-6 are connected internally. When the
MIC SELECT switch is in the HF2 position, P1-32 and P1-16 are connected internally.
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802-009 Switch Panel
SM802 Installation and Operation Manual
Post-Installation Checks 2.4.6
2.4.6.1 Voltage/Resistance Checks
Do not attach the 802-009 until the following conditions are met.
Check the following: a) Check P1, pin 55 for +28 Vdc relative to ground. b) Check P1 pin 54 for continuity to power ground (less than 0.5
Ω). c) Check P1 pin 52 and P1 pin 53 for 115 Vac 400 Hz. d) Check P1 pin 51 for continuity to chassis ground (less than 0.5
Ω). e) Check P1 pin 18 for continuity to ground when the PTT key switch is activated (less than
0.5
Ω). f) Check all shielded cable grounds for continuity to ground (less than 0.5
Ω). g) Check all speaker and mic inputs and outputs for correct HI/LO orientation.
2.4.6.2 Power On Checks
Power up the aircraft’s systems and confirm normal operation of all functions of the 802-009. Refer to
Section 3 (Operation) for specific operational details. a) Begin with only the Pilot's headset installed, no hand mic. Confirm correct radio operation, both receive and transmit and Interphone operation. Check yoke (or cyclic) switch action. b) Plug in the Copilot's headset. Check for correct radio and Interphone operation. Check pilot's transmit priority. Check yoke (or cyclic) switch functions. c) Check Interphone operation between Pilot and Copilot positions. d) Plug in the hand mic, if installed, and test for correct operation in all modes. e) Plug in any remaining headsets, and check for correct Interphone operation.
Note: Incorrect jack wiring is a common fault for rear passenger stations, and may cause a wide range of problems. f) To verify proper operation, all functions and levels shall be checked in-flight. g) Check preset adjustments are completed before aircraft departure.
Upon satisfactory completion of all performance checks, make all required log book entries, electrical load, weight and balance amendments and other documentation as required by your local regulatory agency before releasing the aircraft for service.
2.5 Adjustments and Connections
2.5.1 Adjustments
There are three screwdriver potentiometer adjustments on the 802-009 accessible through access holes in the rear of the unit. These are for OXY MODE INPH VOL, BRIEFER VOL, and SDTN VOL.
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802-009 Switch Panel
SM802 Installation and Operation Manual
The OXY MODE INPH VOL is used to adjust the preset interphone volume when the NORM MIC/OXY
MIC selector switch is in the OXY MIC position and the oxygen mask microphone is in use.
The SDTN VOL is used to adjust the volume of all sidetone inputs together, including PA sidetone.
For BRIEFER VOL description see PASS/BRIEFER in Section 2.4.5.3.
When the potentiometer is rotated fully clockwise, the selected volume will be at maximum and when it is fully counterclockwise, it will be at its minimum.
2.5.2 Electrical Connections
Connections to the 802-009 are made through a single 55 pin MIL-C-26500 cylindrical bayonet coupling type connector. The mating connector to be installed on the aircraft wire harness comes with a coupling nut. A cable support is recommended for strain relief of wires exiting the mating connector.
Description Military Part Number
Cylindrical bayonet coupling type connector
Mating connector (with coupling nut)
Cable support
Numerical pin identification is shown in section 2.5.3.
MS24264R22B55PN
MS24266R22B55SN
MS27291-6
2.5.3 Numerical Pin Identification List
The following table identifies the pins for 55-pin connector P1.
Pin Name
1 No connection (n/c)
Pin
20
Name
TEST MODE JUMPER
2 N/C
3 HOT MIC LO
4 N/C
5 N/C
21
22
23
24
TEST MODE JUMPER
N/C
HAND MIC HI
NORM MIC HI
6 HF-1 ANTENNA SWITCHING
7 PA/Briefer Interconnect
8 PA/Briefer Interconnect
9 HOT MIC HI
10 HAND MIC LO
11 NORM MIC LO
12 MIC AUDIO COMMON
13 N/C
25
26
27
28
29
30
31
OXY MIC HI
OXY MIC LO
HF-1 KEY
VHF-2 KEY
N/C
N/C
MKR HI control
32 HF-1 ANTENNA
14 PA VOLUME
15 OXY MIC MODE
INTERCONNECT
33
34
SWITCHING
N/C
N/C
ANTENNA 35 Ground
17 INPH LISTEN (to GND) 36 GND FROM NORM/OXY MIC
TIPS
18 GND FROM PTT 37 +5 Vdc
19 GND FROM HAND MIC TIP 38 XCVR-5 MIC
Pin Name
39 HF-2 MIC
40 PA MIC
41 HF-1 MIC
42 VHF-2 MIC
43 VHF-1 MIC
44 XCVR-5 KEY
45 HF-2 KEY
46 PA KEY
47 VHF-1 KEY
48 MUX DATA HI
49 MUX DATA LO
50 NORM discrete output
52
53
115 VAC, 400 Hz Hot
115 VAC, 400 Hz common
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2.6
802\521-0
802-009 Switch Panel
SM802 Installation and Operation Manual
Installation Drawings
Switch Interconnect
Switch Interconnect
1.01 Switch Panel Environmental Qualification Form
Section 2 ends following the above documents
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ENVIRONMENTAL QUALIFICATION FORM
Description:
Switch Panel
Document No.:
802\521-0
NAT Part No.: 802-xxx TSO Authorization:
TSO-C50c
Manufacturer’s Specification and/or Other Applicable Specification:
RTCA DO-160C
Manufacturer: Wulfsberg Electronics Division
Address:
Prepared By:
6400 Wilkinson Drive, Prescott, AZ 86301-6164, USA
Checked By: Approved By:
CONDITIONS
Temperature and altitude
DO-160C
SECTION/
PARAGRAPH
4.0
DESCRIPTION OF CONDUCTED TESTS
Low temperature
High temperature
In-flight loss of cooling
4.5.1
4.5.2
4.5.3
4.5.4
Equipment tested to Category [(A2)(F2)-], except as noted.
-55°C (operating and ground survival)
+85°C (ground survival)
+70°C (short time operating)
+70°C (operating)
N/A. No forced air cooling.
Decompression
Temperature variation
Humidity
Operational shocks and
Crash safety
Operational shocks
Crash safety
4.6.2
5.0
6.0
7.0
7.2
7.3
8,000 ft to +70,000 ft.
Equipment tested to Category B.
Equipment tested to Category A.
Equipment tested without shock mounts per
DO-160C, paragraphs 7.2.1, 7.3.1, 7.3.2, and
7.3.2.2.
Explosion proofness
Fluids susceptibility
Sand and dust
9.0
11.0
12.0
Category L, except extended curve 150-
2,000 Hz 3g pk. No change in critical frequencies during test. Equipment tested without shock mounts to Category C.
Change in critical frequency in Z-axis from
150.2 Hz to 118.1 Hz.
Equipment identified as Category X, no test performed. performed.
Equipment identified as Category X, no test performed.
Equipment identified as Category X, no test performed.
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CONDITIONS
DO-160C
SECTION/
PARAGRAPH
14.0
DESCRIPTION OF CONDUCTED TESTS
Salt spray
Magnetic effect
Power input
Voltage spike
Fungus resistance
15.0
16.0
17.0
13.0
Equipment identified as Category X, no test performed.
Equipment is Class Z.
Equipment tested to Categories B and Z, including:
• Subparagraph 16.5.1.4b requirement for equipment with digital circuits.
• Emergency operating voltage.
Equipment tested to Category A.
Equipment identified as Category X, no test performed.
Equipment tested to Category Z. Audio frequency conducted susceptibility
Induced signal susceptibility
Radio frequency susceptibility
Emission of radio frequency energy
Lightning induced transient susceptibility
Lightning direct effects
18.0
19.0
20.0
Pre Change no. 3
21.0
22.0
Pre Change no. 2
23.0
Equipment tested to Category Z.
Equipment tested to Category U.
Equipment tested to Category Z.
Equipment tested to Category L.
Equipment identified as Category X, no test performed. performed.
Remarks:
• Tests of DO-160C, sections 4.0 (paragraphs 4.5.1, 4.5.2, and 4.5.3), 5.0, 16.0 (except subparagraph
16.5.2.3b), and 18.0 were conducted on both the 902-21 Digital Multiplexing Unit subassembly and the Model 802-001 Switch Panel at dB Systems, Inc. in Redmond, Washington.
• Tests of DO-160C, sections 16.0 (subparagraph 16.5.2.3 b), 17.0, 19.0, and 21.0 were conducted on the 902-21 Digital Multiplexing Unit subassembly at Sundstrand Data Control, Inc. in Redmond,
Washington.
• Tests of DO-160C, sections 4.0 (paragraphs 4.6.1, 4.6.2, and 4.6.3), 6.0, 7.0, 8.0, 15.0, 19.0, 20.0, and 22.0 were conducted on the Model 802-001 Switch Panel at Sundstrand Data Control, Inc. in
Redmond, Washington.
• The Model 802-xxx is qualified by similarity (with respect to the 902-21 Digital Multiplexing Unit subassembly) to TSO-C50c for the tests of DO-160C, sections 16.0 (subparagraph 16.5.2.3b), 17.0, and 21.0.
End of Environmental Qualification Form
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802-009 Switch Panel
SM802 Installation and Operation Manual
Section 3 Operation
3.1 Introduction
Information in this section consists of functional and operational procedures for the 802-009 Switch Panel.
3.2 General Information
The 802-009 Switch Panel shown in Figure 1 is designed to control a single Model 700-xxx Digital Audio
Control Amplifier. It also provides microphone audio switching and keying operations for four radio transmitters in addition to features such as antenna switching unit control, marker (MKR) receiver sensitivity control and public address (PA) amplifier control. The 802-009 Switch Panel continuously reads the status of its own audio control switches and volume control potentiometers and compiles this information into the form of a digital signal. The digital signal is sent to the Model 700 from the switch panel in RS422 serial format via a twisted, shielded wire pair. The Model 700 receives, demultiplexes and converts this digital signal into useful audio control information.
The 802-009 Switch Panel is capable of digitally controlling all Model 700 amplifier functions. These include the 12 receiver input switches and individual volume controls, the four sidetone input switches and sidetone volume control, the three microphone input switches, the interphone switches and volume control, the cockpit speaker switch and volume control, the headphone volume control and the NAV/ADF
Voice/Ident filter switching functions. Refer to the Model 700 Digital Audio Control Amplifier Equipment
Manual (NAT Seattle Document 700-16) for more specific information on Model 700 functions.
Figure 1: 802-009 Switch Panel
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802-009 Switch Panel
SM802 Installation and Operation Manual
Controls and Indicators 3.3
3.3.1 Master Volume, Transceiver and Receiver Controls
These controls are alternate action press-on/press-off rotary switches that control various functions of the Model 700. All knobs, except PHONE and PASS, control both switching and volume control of the respective audio.
When the knob is in the OUT position, the relevant function is selected (on), and the knob is illuminated to indicate that the control has been selected.
When the knob is in the IN position, the relevant function is deselected (off), and the knob is not illuminated.
The rotary function of the switch adjusts the relevant volume.
The different functions controlled by the press-on/press-off (switch) and rotary portions of the control will be outlined in the appropriate sections below.
The PHONE and PASS volume control knobs remain in the OUT and lighted position at all times.
3.3.1.1 Master Volume Controls
The Master Volume control functions are outlined in Table 1 below.
Control Name Switch Function
INPH (Interphone) Selects the INPH Hot switch function
PHONE
SPKR (Speaker)
PASS
No function
Speaker switch function volume
No function
Rotary Function
Interphone volume control
Headphone volume control
Speaker volume control
PA amplifier output volume
Table 1
Master Volume Control Functions
3.3.1.2 Transceiver Controls
The receiver and sidetone functions of the VHF1, VHF2, HF1 and HF2 transceivers are selected and deselected using the press-on/press-off functions of the appropriate controls and the rotary function adjusts the respective volumes.
3.3.1.3 Receiver Controls
The receiver controls - NAV1, NAV2, ADF1, ADF2, DME1, DME2, MKR1 and MKR2 - function in the same way as the transceiver controls (see section 3.3.1.2).
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3.3.2
3.3.3
3.3.4
3.3.5
802-009 Switch Panel
SM802 Installation and Operation Manual
MIC SELECT Switch
The MIC SELECT switch is a 5-position rotary control (VHF1, VHF2, HF1, HF2, and
PASS) used to select the transceiver for transmission.
During PTT key, it connects the mic input to the selected transmitter or PA mic output. In transmitter positions, it turns on the PTT Mute function of the Model 700, and in the PASS position, it turns on the PA Key (sidetone) function of Model 700 and enables PASS volume control to the PA amplifier. In the HF1 and HF2 positions it allows for antenna switching unit control.
BOTH/VOICE/IDENT Switch
The BOTH/VOICE/IDENT switch is a three-position switch used for selecting the navigation filter modes.
BOTH position: No filtering, both identifier and voice filtering functions are switched off.
VOICE position: Voice filtering is switched on.
IDENT position: Identifier filtering is switched on.
NORM MIC/OXY MIC Switch
The NORM MIC/OXY MIC switch is a two-position rotary control used to select the mic for transmission/PA use. During PTT, the selected Mic is connected to the HOT MIC output and to the selected transmitter mic output.
NORM MIC: Connects the normal mic input to the HOT MIC output.
OXY MIC: Connects the Oxygen mic input to HOT MIC output. Also turns
ON the following Model 700 functions: INPH Hot switch, INPH to
SPKR switch and Speaker switch.
HI/LO MKR Sensitivity Switch
The HI/LO MKR Sensitivity switch is a two-position switch used to select the Marker receiver sensitivity.
Transmission Functions 3.3.6
3.3.6.1 Keyed Transmission
To key a selected transmitter, the pilot may either use the yoke mounted Push-To-Talk (PTT) key switch with the NORM or OXY microphones or the PTT key switch on a hand-held microphone. The MIC
SELECT rotary switch on the 802-009 Switch Panel determines which transmitter is to be keyed and
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802-009 Switch Panel
SM802 Installation and Operation Manual
connected to the microphone input being used. If the MIC SELECT switch is in any of the four transmitter positions and the SPKR switch is ON, then during a transmit PTT the cockpit speaker volume will be muted to a preset level determined by the SPKR MUTE adjustment on the Model 700 Amplifier. If the
INPH switch is ON, then the HOT MIC interphone volume will be completely muted during a transmit PTT as defined in Model 700 software logic.
3.3.6.2 PA Transmission
To key the passenger address amplifier and adjust its volume, the MIC SELECT switch must be placed in the PASS position. The PA amplifier may then be keyed by either hand mic or yoke PTT key switches and a passenger address announcement may be made to the cabin. The PASS volume controls the volume of the PA amplifier output. The cockpit speaker and interphone volumes are not muted during transmit PTT when the MIC SELECT switch is in the PASS position. PA sidetone will be switched ON during PASS transmit PTT through Model 700 amplifier control, but only if the Model 700 PA sidetone input has audio connected to it. Examples of PA amplifiers compatible with the 802-009 PASS key and volume controls are the NAT Models 205, 240, 250, or 251 Passenger Speaker Amplifiers.
3.3.6.3 Mic Selection
The NORM MIC/OXY MIC rotary switch on the 802-009 selects either the normal boom mic or oxygen mask mic, depending on its position.
In the NORM MIC position, the NORM mic input is connected to the HOT MIC output and during a transmit PTT it is connected to the selected transmitter or PA amplifier.
In the OXY MIC position, the OXY mic input is connected to the HOT MIC output and during a transmit
PTT it is connected to the selected transmitter or PA amplifier. In addition, the INPH and SPKR switches are automatically turned ON, the interphone to speaker function of the Model 700 is initialized and the interphone volume is set to a preset level determined by the OXY MODE INPH VOL adjustment, which is accessible through a hole in the rear of the 802-009 enclosure. All selected receiver audio, interphone audio and transmit sidetone audio will be heard over the cockpit speaker in the OXY MIC mode of operation. If the OXY MIC MODE INTERCONNECT connection is wired between pilot and copilot
802-009 Switch Panels, then both audio systems will go into this operating mode when either one or the other selects the OXY MIC position on the NORM MIC/OXY MIC selector switch and only the switch panel(s) with OXY MIC selected must use the oxygen mask microphone. In either position, the hand mic with its transmit PTT will override the selected NORM or OXY mic for transmitting only.
Section 3 ends
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Key features
- Controls a single Model 700 Digital Audio Control Amplifier
- Microphone audio switching and keying operations for four radio transmitters
- Antenna switching unit control
- Marker (MKR) receiver sensitivity control
- Public address (PA) amplifier control
- Continuously reads status of own audio control switches and volume control potentiometers
- Digital signal sent to Model 700 in RS422 serial format
- Controls all Model 700 amplifier functions
- Customizable unit capable of providing control for up to four transceivers, eight receivers and a public address